Double whole note

In medieval mensural notation, the brevis was one of the shortest note lengths in use,[3] hence its name, which is the Latin etymon of "brief".[4][vague] In modern notation, a breve is commonly represented in either of two ways: by a hollow oval note head, like a whole note, with one or two vertical lines on either side, as on the left and right of the image, or as the rectangular shape also found in older notation, shown in the middle of the image.[5][6] Because it lasts longer than a bar in most modern time signatures in common use, the breve is rarely encountered except in English music, where the half-note is often used as the beat unit.[2][8]) Double whole rests are drawn as filled-in rectangles occupying the whole vertical space between the second and third lines from the top of the musical staff.In the mensural notation of the Renaissance, it was an alternative term for proportio dupla, which meant that the brevis was to be considered the unit of time (tactus), instead of the usual semibrevis.
Left: breve in modern notation. Centre: breve in mensural notation used in some modern scores as well. Right: less common stylistic variant of the first form.
Breve rest
whole notemusic notationmaximamensural notationetymonnote headtime signaturesEnglish musicmusical stafftime signatureAlla brevetactuscrotchetsList of musical symbolsRead, GardnerSadie, StanleyTyrrell, Johnnote valuesOctuple whole note (maxima)Quadruple whole note (longa)Whole note (semibreve)Half note (minim)Quarter note (crotchet)Eighth note (quaver)Sixteenth note (semiquaver)Thirty-second note (demisemiquaver)Sixty-fourth note (hemidemisemiquaver)Hundred twenty-eighth note (semihemidemisemiquaver)Two hundred fifty-sixth note (demisemihemidemisemiquaver)Dotted noteGrace noteSwung noteTremoloTuplet